The Universal Gel Cell Battery is a state of the art battery design. This battery is a sealed (Non-Spillable) requires no addition of water during the life of the battery. The Battery is TRUE DEEP CYCLE and can be mounted in any position, requires no maintenance and may be transported by Air or Ground without any special handling regulations. When a Gel Cell battery is charged no hazardous fumes escape the battery case, gases are processed within the battery itself. Additional Features: Gel Cell design yields extreme Deep Cycle Service Performance rating Less than 3% per month standing self discharge. Maintenance Free Valve Regulated Float and Cycle Use Gel Cell design may offer greater reliability in extreme temperature applications Leak Proof/Spill Proof